Some Fossies usage hints in advance:

To see the Doxygen generated documentation please click on one of the items in the steelblue colored "quick index" bar above or use the side panel at the left which displays a hierarchical tree-like index structure and is adjustable in width.

If you want to search for something by keyword rather than browse for it you can use the client side search facility (using Javascript and DHTML) that provides live searching, i.e. the search results are presented and adapted as you type in the Search input field at the top right.

Doxygen doesn't incorporate all member files but just a definable subset (basically the main project source code files that are written in a supported language). So to search and browse all member files you may visit the Fossies

Terraform

Terraform is a tool for building, changing, and versioning infrastructure safely and efficiently. Terraform can manage existing and popular service providers as well as custom in-house solutions.

The key features of Terraform are:

Infrastructure as Code: Infrastructure is described using a high-level configuration syntax. This allows a blueprint of your datacenter to be versioned and treated as you would any other code. Additionally, infrastructure can be shared and re-used.

Execution Plans: Terraform has a "planning" step where it generates an execution plan. The execution plan shows what Terraform will do when you call apply. This lets you avoid any surprises when Terraform manipulates infrastructure.

Resource Graph: Terraform builds a graph of all your resources, and parallelizes the creation and modification of any non-dependent resources. Because of this, Terraform builds infrastructure as efficiently as possible, and operators get insight into dependencies in their infrastructure.

Change Automation: Complex changesets can be applied to your infrastructure with minimal human interaction. With the previously mentioned execution plan and resource graph, you know exactly what Terraform will change and in what order, avoiding many possible human errors.

Developing Terraform

If you wish to work on Terraform itself or any of its built-in providers, you'll first need Go installed on your machine (version 1.11+ is required).

This repository contains only Terraform core, which includes the command line interface and the main graph engine. Providers are implemented as plugins that each have their own repository in the terraform-providers organization on GitHub. Instructions for developing each provider are in the associated README file. For more information, see the provider development overview.

For local development of Terraform core, first make sure Go is properly installed and that a GOPATH has been set. You will also need to add $GOPATH/bin to your $PATH.

Next, using Git, clone this repository into $GOPATH/src/github.com/hashicorp/terraform.

You'll need to run make tools to install some required tools, then make. This will compile the code and then run the tests. If this exits with exit status 0, then everything is working! You only need to run make tools once (or when the tools change).

$ cd"$GOPATH/src/github.com/hashicorp/terraform"$ make tools$ make

To compile a development version of Terraform and the built-in plugins, run make dev. This will build everything using gox and put Terraform binaries in the bin and $GOPATH/bin folders:

$ make dev...$ bin/terraform...

If you're developing a specific package, you can run tests for just that package by specifying the TEST variable. For example below, only terraform package tests will be run.

$ make test TEST=./terraform...

If you're working on a specific provider which has not been separated into an individual repository and only wish to rebuild that provider, you can use the plugin-dev target. For example, to build only the Test provider:

$ make plugin-dev PLUGIN=provider-test

Dependencies

Terraform uses Go Modules for dependency management, but for the moment is continuing to use Go 1.6-style vendoring for compatibility with tools that have not yet been updated for full Go Modules support.

If you're developing Terraform, there are a few tasks you might need to perform.

Adding a dependency

If you're adding a dependency, you'll need to vendor it in the same Pull Request as the code that depends on it. You should do this in a separate commit from your code, as makes PR review easier and Git history simpler to read in the future.

To add a dependency:

Assuming your work is on a branch called my-feature-branch, the steps look like this:

Add an import statement to a suitable package in the Terraform code.

Run go mod vendor to download the latest version of the module containing the imported package into the vendor/ directory, and update the go.mod and go.sum files.

Review the changes in git and commit them.

Updating a dependency

To update a dependency:

Run go get -u module-path@version-number, such as go get -u github.com/hashicorp/hcl@2.0.0

Run go mod vendor to update the vendored copy in the vendor/ directory.

Review the changes in git and commit them.

Acceptance Tests

Terraform has a comprehensive acceptance test suite covering the built-in providers. Our Contributing Guide includes details about how and when to write and run acceptance tests in order to help contributions get accepted quickly.

Cross Compilation and Building for Distribution

If you wish to cross-compile Terraform for another architecture, you can set the XC_OS and XC_ARCH environment variables to values representing the target operating system and architecture before calling make. The output is placed in the pkg subdirectory tree both expanded in a directory representing the OS/architecture combination and as a ZIP archive.

For example, to compile 64-bit Linux binaries on Mac OS X, you can run:

XC_OS and XC_ARCH can be space separated lists representing different combinations of operating system and architecture. For example, to compile for both Linux and Mac OS X, targeting both 32- and 64-bit architectures, you can run:

Note: Cross-compilation uses gox, which requires toolchains to be built with versions of Go prior to 1.5. In order to successfully cross-compile with older versions of Go, you will need to run gox -build-toolchain before running the commands detailed above.

Docker

When using docker you don't need to have any of the Go development tools installed and you can clone terraform to any location on disk (doesn't have to be in your $GOPATH). This is useful for users who want to build master or a specific branch for testing without setting up a proper Go environment.

For example, run the following command to install the required tools and build terraform in a linux-based container for macOS.